[llvm] [AMDGPU] Add SSA-form memory clause pass (AMDGPUFormSSAMemoryClauses) (PR #209656)

[Jun Wang via llvm-commits]

jwanggit86 wrote:

> > Also I would expect this to be called something like `SIFormSSAMemoryClauses` or `GCNFormSSAMemoryClauses`, i.e. maintaining an existing prefix with SSA somewhere later in the name.
> 
> `AMDGPUFormSSAMemoryClauses.cpp` would fit well. We shouldn't introduce any more SI* GCN* filenames. We must change the existing filenames at some point to use the AMDGPU prefix.

Done.

https://github.com/llvm/llvm-project/pull/209656